Effects of Nitrogen Fertilizer on Nitrogen Use Efficiency and Yield of Rice under Different Soil Conditions

YE Quan-Bao,ZHANG Hong-Cheng~,WEI Hai-Yan,ZHANG Ying,WANG Ben-Fu,XIA Ke,HUO Zhong-Yang,DAI Qi-Gen,XU Ke(Engineering & Technology Center for Crop Cultivation,Yangzhou University,Yangzhou 225009,Jiangsu,China)  

Nitrogen is the indispensable nutrient to rice production.The uptake of nitrogen are affected by varietal characteristics,fertilizer application,soil condition and environment factors.Rational application technique and nitrogen use efficiency for rice in the field have been studied by many scholars,which had a direct effect on high-yield and high-efficiency production of rice.However,all of them were studied under the same soil condition.There have been limited studies on the nitrogen use efficiency and yield under different soil conditions.In fact,the difference of soil condition consequentially results in the difference of nutrient uptake in rice under the same land tillage and management in the same region.Four rice cultivars were used to study the effects of nitrogen fertilizer on nitrogen use efficiency,yield and characters of nitrogen uptake under two soil conditions(sandy and clay soil) in soil culture pool.The results were as follows:(1) Yield of rice in sandy and clay soil was increased by nitrogen application,and that in clay soil was higher than that in sandy soil,but the effect of nitrogen on yield increment was greater in sandy soil than in clay soil.(2) Nitrogen utilization of rice was different under different soil conditions.NHI(N harvest index) and PNUE(physiological N use efficiency) were higher in sandy soil than in clay soil. ANRE(apparent N recovery efficiency),PFP(partial factor productivity for applied N) and SNDR(soil N dependent rate) were higher in clay soil than in sandy soil.ANUE was varied in different cultivars under different soil conditions.(3) NHI,ANUE(agronomic N use effciency),PNUE,PFP and SNDR were decreased significantly with the increment of amount of nitrogen applied under the two soil conditions.In sandy soil,ANRE increased with the increasing nitrogen application and reached the highest value at high nitrogen level.However,in clay soil,ANRE was increased with increasing of the nitrogen application at first,and reached the highest value at medium nitrogen level,then decreased dramatically at high nitrogen level.(4) N uptake rate for rice straw and for rice grain and total N uptake rate for rice were higher in sandy clay soil than in sandy soil,but the difference between them was relatively little.(5) Under different soil conditions,there were significant genotypic differences in effects of applying nitrogen fertilizer on nitrogen use efficiency,yield and characters of nitrogen uptake.

【Key Words】： Rice Soil condition Application of nitrogen fertilizer Nitrogen use efficiency Effect of yield increasing Characters of nitrogen uptake
【Fund】： 国家自然科学基金(30370827);; 国家科技攻关计划(2004BA520A03);; 中国科学院南京土壤研究所土壤圈物质循环重点实验室课题;; 江苏省高等学校研究生创新计划项目
【CateGory Index】： S511

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